873
FZUS51 KBOX 280206
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 PM EDT Wed Aug 27 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM

ANZ200-281500-
1005 PM EDT Wed Aug 27 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
Upper level low pres continues over the waters tonight with high
pres then building south of our waters Thu. The next cold front will
cross the waters sometime later Fri into Fri night, with high pres
then building back in for the weekend.

$$

ANZ250-281500-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 9 seconds and S 1 foot at 7 seconds.
.THU...W winds around 5 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at
6 seconds and SE 2 ft at 9 seconds.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at
8 seconds.
.FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW
3 ft at 4 seconds and E 2 ft at 8 seconds. A chance of showers. A
chance of tstms in the afternoon.
.FRI NIGHT...S winds 10 to 15 kt, becoming W after midnight.
Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at
4 seconds and E 1 foot at 8 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT...W winds around 10 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: W 1 foot at 3 seconds and SE 1 foot at
4 seconds. A chance of showers in the morning.
.SAT NIGHT...SW winds around 10 kt, becoming NW after midnight.
Seas around 2 ft.
.SUN THROUGH MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ251-281500-
Massachusetts Bay and Ipswich Bay-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 9 seconds and S 1 foot at 4 seconds.
.THU...W winds around 5 kt, becoming S in the afternoon. Seas
2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and E 2 ft at
9 seconds.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at
9 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 4 seconds and E 1 foot at 8 seconds.
A chance of showers in the morning, then showers likely with a
chance of tstms in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 5 seconds and E 1 foot at 8 seconds. Showers likely with a
chance of tstms in the evening, then a chance of showers after
midnight.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: W 1 foot at 2 seconds and SE 1 foot at 4 seconds.
.SUN THROUGH MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ231-281500-
Cape Cod Bay-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 9 seconds and NW 1 foot at 3 seconds.
.THU...W winds around 5 kt, becoming S 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and
NW 1 foot at 3 seconds.
.THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 1 foot at 4 seconds
and E 1 foot at 9 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
8 seconds. A chance of showers. A chance of tstms in the
afternoon.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
3 seconds and E 1 foot at 4 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT...W winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NW
1 foot at 3 seconds and S 1 foot at 4 seconds. A chance of
showers in the morning.
.SAT NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
1 foot or less.
.SUN THROUGH MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ254-281500-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 9 seconds and S 2 ft at 7 seconds.
.THU...W winds around 5 kt, becoming SW in the afternoon. Seas
2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and SE 2 ft at
9 seconds.
.THU NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 4 seconds and SE 2 ft at 8 seconds. Patchy fog in the
evening with vsby 1 to 3 NM.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds.
A chance of showers in the afternoon.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at
8 seconds. A chance of showers.
.SAT...W winds around 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 5 seconds and W 1 foot at 3 seconds. A chance of showers in
the morning.
.SAT NIGHT...SW winds around 10 kt, becoming W after midnight.
Seas around 2 ft.
.SUN THROUGH MON NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ255-281500-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Seas around 3 ft. Wave Detail:
SW 2 ft at 6 seconds and SE 2 ft at 9 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 6 seconds and SE 2 ft at 9 seconds.
.THU NIGHT...S winds 5 to 10 kt, increasing to 10 to 15 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and E
2 ft at 8 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: S 4 ft at 5 seconds and E 1 foot at 8 seconds.
A chance of showers.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
SW after midnight. Seas 2 to 4 ft. Wave Detail: SE 4 ft at
7 seconds and W 1 foot at 3 seconds. A chance of showers.
.SAT...W winds around 10 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers in
the morning.
.SAT NIGHT...W winds around 10 kt, becoming NW after midnight.
Seas around 2 ft.
.SUN THROUGH MON NIGHT...E winds 10 to 15 kt. Seas 2 to 4 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ256-281500-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: W
2 ft at 4 seconds and S 2 ft at 7 seconds.
.THU...W winds around 5 kt, becoming SW in the afternoon. Seas
2 to 3 ft. Wave Detail: W 2 ft at 4 seconds and S 2 ft at
7 seconds.
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: S 3 ft at 7 seconds and SW 2 ft at
4 seconds.
.FRI...S winds around 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 7 seconds. A chance of showers.
.FRI NIGHT...SW winds around 15 kt with gusts up to 20 kt,
becoming NW after midnight. Seas 3 to 4 ft. Wave Detail: SW 4 ft
at 6 seconds and NW 1 foot at 3 seconds. A chance of showers.
.SAT AND SAT NIGHT...NW winds around 10 kt. Seas 2 to 3 ft. Wave
Detail: W 2 ft at 5 seconds and E 1 foot at 8 seconds.
.SUN THROUGH MON NIGHT...E winds 10 to 15 kt. Seas 2 to 4 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ232-281500-
Nantucket Sound-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
W 1 foot at 3 seconds and S 1 foot at 6 seconds.
.THU...W winds around 5 kt, becoming SW 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds
and SW 1 foot at 6 seconds.
.THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 4 seconds and E 1 foot at 9 seconds.
.FRI...S winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 4 seconds and E 1 foot at 8 seconds. A chance of showers.
.FRI NIGHT...S winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and
SE 1 foot at 4 seconds. A chance of showers.
.SAT...W winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
1 foot at 4 seconds and E 1 foot at 8 seconds. A chance of
showers in the morning.
.SAT NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Seas around 2 ft.
.SUN THROUGH MON NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ233-281500-
Vineyard Sound-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
W 1 foot at 4 seconds and S 1 foot at 7 seconds.
.THU...W winds around 5 kt, becoming SW 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: SW 1 foot at 5 seconds
and SE 1 foot at 9 seconds.
.THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 7 seconds and SW 1 foot at 3 seconds.
.FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers. A
chance of tstms in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at
7 seconds and W 1 foot at 3 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT AND SAT NIGHT...NW winds around 10 kt. Seas around 2 ft.
Wave Detail: W 2 ft at 4 seconds and SE 1 foot at 8 seconds.
.SUN THROUGH MON NIGHT...E winds 10 to 15 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ234-281500-
Buzzards Bay-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SW 1 foot at 5 seconds and SE 1 foot at 9 seconds.
.THU...W winds around 5 kt, becoming SW 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 3 seconds and SW 1 foot at 6 seconds.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at
9 seconds.
.FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW
3 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of
showers. A chance of tstms in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt,
becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft
at 7 seconds and SW 1 foot at 3 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: NW 1 foot at 3 seconds and SW 1 foot at 6 seconds.
.SUN THROUGH MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ235-281500-
Rhode Island Sound-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: W
2 ft at 4 seconds and S 2 ft at 7 seconds.
.THU...W winds around 5 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and
S 2 ft at 7 seconds.
.THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and
SE 1 foot at 8 seconds.
.FRI...S winds around 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers. A chance of tstms in the
afternoon.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT AND SAT NIGHT...NW winds around 10 kt. Seas around 2 ft.
Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds.
.SUN THROUGH MON NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ237-281500-
Block Island Sound-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 7 seconds and SE 2 ft at 9 seconds.
.THU...W winds around 5 kt, becoming SW in the afternoon. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and S 2 ft at
7 seconds.
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at
9 seconds.
.FRI...S winds around 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers. A chance of tstms in the
afternoon.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 5 seconds and NW 1 foot at 3 seconds.
.SUN THROUGH MON NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ230-281500-
Boston Harbor-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.THU...W winds around 5 kt, becoming S in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.THU NIGHT...S winds around 10 kt. Waves around 2 ft.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. A chance of showers in the morning, then showers likely
with a chance of tstms in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Waves around 2 ft in the
evening, then 1 foot or less. Showers likely with a chance of
tstms in the evening, then a chance of showers after midnight.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less.
.SUN THROUGH MON NIGHT...S winds 5 to 10 kt. Waves around 2 ft.

Winds and waves higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ236-281500-
Narragansett Bay-
1005 PM EDT Wed Aug 27 2025

.OVERNIGHT...NW winds 5 to 10 kt. Waves around 2 ft.
.THU...W winds around 5 kt, becoming SW 10 to 15 kt in the
afternoon. Waves around 2 ft.
.THU NIGHT...S winds around 10 kt. Waves around 2 ft.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. A chance of showers in the morning, then showers likely
with a chance of tstms in the afternoon.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW 5 to 10 kt after midnight. Waves around 2 ft. A
chance of showers. A chance of tstms in the evening.
.SAT AND SAT NIGHT...NW winds 5 to 10 kt. Waves around 2 ft.
.SUN THROUGH MON NIGHT...SW winds 5 to 10 kt. Waves around 2 ft.

Winds and waves higher in and near tstms.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

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